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Catalyzes the reduction of free and protein-bound methionine sulfoxide to methionine. Isoform 2 is essential for hearing.

The protein encoded by this gene catalyzes the reduction of methionine sulfoxide to methionine. This enzyme acts as a monomer and requires zinc as a cofactor. Several transcript variants encoding two different isoforms have been found for this gene. One of the isoforms localizes to mitochondria while the other localizes to endoplasmic reticula. [provided by RefSeq, Jul 2010]

Taken together, these data provide evidence that the ER type of MsrB, MsrB3A, plays an important role in protection mechanisms against oxidative, cold and heat stresses and, moreover, in the regulation of fruit fly aging.

an in vitro assay revealed that p.Cys89Gly completely abolished MSRB3 enzymatic activity and that p.Arg19X is a null allele for MSRB3 mitochondrial isoforms, indicating that DFNB74 deafness might be a mitochondrial disease limited to the inner ear.